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-4× = -20
x = 5
×+2=5+2=7
b. umur ayah = 28 + b
umur anak = b
28+b+b = 48
2b = 20
b = 10 thun
-4× = -20
x = 5
×+2=5+2=7
b. umur anak = x
umur ayah = x=28 = 48
x+x+28 = 48
2x+ 28 - 28 = 48
2x = 20
2x/2x = 20/2 = 10
= 10 + 38 = 48
jadi, umur anak ketika lahir = 10 thn